## Regression line

After clicking , draw a rectangle with the mouse enclosing the points to which a line has to be adjusted. The line is created. If a point is free, the line follows when the point is dragged. The menu Equation-Export as function allows obtaining the regression function. In this case, the parameters can be explicitly instantiated: |

## Deviation from a curve

For a regression other than linear, a curve being drawn, Casyopée offers the possibility to create a geometric calculation "Sum of squares of deviations", of a series of points from this curve (the differences being calculated "vertically). The calculation is created by the Geometric Calculations-adjustment menu. Successively click the points then click the curve to complete. The calculation and its current value are displayed. In case of the curve of a parametric function, it is possible to drag the sliders in order to get a better adjustement. |

**06/10/2014 - 18h08**

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